Double glazed windows are a sensible investment, adding extra comfort to your home alongside energy efficiency and security.
However, if you’re in the process of choosing which double glazed windows to buy, or deciding if you need a repair or replacement, it can be difficult to know where to start. With so many types of glass and frames to choose from, how do you know which ones are right for you?
We’ve broken down the different types of double glazing and things to consider before buying.
What is double glazing and how does it work?
Double glazing consists of two panes of glass that are separated by a layer of gas or air. The gap acts as insulation and reduces heat loss, noise and condensation inside your home.
Want to learn more about the benefits of double glazing? Check out our guide to double glazing benefits.
Types of double glazing glass
Let’s talk about the different glass options available to you when you buy double glazing. The type of glass you choose can impact many things, from energy efficiency to security and noise control.
Here’s an overview of the most common types of double glazing glass:
| Glass Type | What it it | Why choose it | Where it’s used |
| Toughened glass | Heat-treated safety glass that shatters into small, blunt pieces if broken. | Stronger than standard glass & meets UK safety regulations. | Patio doors, low windows, or any areas prone to knocks or impact. |
| Low-Emissivity (Low-E) Glass | Glass with an invisible coating that reflects heat back into your home. | Helps reduce heat loss and energy bills while keeping rooms cosy. | Standard in most new units for external windows/doors. |
| Self-Cleaning Glass | Special coating uses daylight and rain to break down and rinse away dirt. | Reduces cleaning time and keeps your glass looking clearer for longer. | Conservatory roofs, skylights, or hard-to-reach windows. |
| Obscured (Patterned/
Frosted) |
Textured or frosted glass that blurs visibility while letting in light. | Adds privacy without blocking natural light. Also comes in decorative designs. | Bathrooms, front doors, and overlooked windows. |
What to consider when buying double glazed windows
Buying the right double glazing is a big decision, and the best option for you will depend on your home’s needs, your lifestyle, and how much you’re willing to invest for long-term performance.
Below, we’ve broken down the key factors to help you make an informed decision.
1. Set your budget – but remember double glazing is an investment
The amount you spend on double glazing is influenced by many things:
- The size of your windows
- The style of windows you choose
- The type of glass you have
- The material of your window frames
It’s natural to select your windows so the price is as low as possible, particularly if you have a tight budget.
However, it’s best to think about the bigger picture and not rule out higher-spec options just to keep costs down in the short term. Higher-spec glass or frames are likely to bring longer-term benefits, such as keeping your house warmer in the winter and helping you to save on energy bills.
Of course, balancing long-term benefits and upfront costs is a balancing act. For a better understanding of price points, check out our guide to double glazing costs for average cost and repair options.
2. Prioritise energy efficiency windows and ask about energy ratings
Making your home more energy efficient is one of the biggest reasons people upgrade their windows. If energy efficiency is a top priority, it’s crucial to know what to look for.
In the UK, double glazed windows come with an energy rating label, just like fridges and washing machines do. These labels range from A++ (which is the most efficient rating) through to G. The higher the rating, the better your windows are at keeping the heat in and the cold out.
You should also know that if you’re getting new or replacement windows, UK Building Regulations stipulate that they must be at least a B rating or better, so check the rating before you buy.
Learn more about how energy efficient windows work and the benefits they have in your home.
3. Think about the security features of your windows
Your windows don’t just let in light, they also play a big part in keeping your home secure. Consider if the windows you’re buying come with built-in security features for that added peace of mind.
Most modern windows have multi-point locking systems. This secures the window at several points with one easy turn of the handle, making them much harder to force open than older single-lock designs.
Look to see if windows meet the recognised security standards. PAS 24 is the standard of testing that shows windows and doors have been tested for optimal break-in resistance.
4. Buy a window style that suits your home and surrounding area
Windows can influence curb appeal, so buying the right style of windows for your home is probably more important than you think, particularly if you’re considering selling your home in the future.
From modern casement windows to traditional sash designs, the right style will depend on your home’s character, the era it was built and your preferences.
Casement windows
Casement windows are a classic and practical choice that will suit most homes. Hinged at the side, they open outwards with a hinge mechanism. Simple and versatile, they are a popular choice for homeowners with both modern and traditional properties.
Sash windows
Sash windows are more of a traditional option for period or heritage properties. They slide up and down vertically and can be designed with a tilt-and-turn mechanism for better practicality. They are ideal for homeowners looking to preserve traditional aesthetics and benefit from the insulation and security of double glazing.
Tilt & turn windows
Tilt-and-turn windows are a popular choice for modern homes, flats, and properties where external window access is limited. They offer easy cleaning, flexible ventilation and enhanced security. Their inward-opening design also makes them a safe option for families with young children.
5. Buy the right window frame material
Alongside the type of double glazed windows you choose, you should also carefully consider the different frame materials available. Window frame material, much like window type, can influence aesthetics and curb appeal. In addition, window frames also impact performance (think energy efficiency, maintenance and longevity).
UPVC window frames
- Affordable, energy-efficient, and low maintenance; a popular all-rounder.
Aluminium window frames
- Sleek and strong, ideal for modern homes or large glass panes.
Timber window frames
- Natural and traditional in style, but needs more regular upkeep. Popular choice for heritage properties.
Want to see how window style and frame material choices impact the overall cost of your double glazing? Read our double glazing price guide.
Replacing vs repairing: Know your options
If your current double glazing is misted, draughty or damaged, you may not need to replace the entire window. In many cases, you can simply replace the sealed glass unit, saving money, time and disruption.
Need advice or a quote?
Cloudy2Clear specialises in glass-only double glazing repairs, helping you restore comfort, clarity and insulation without replacing your frames. Whether it’s misted panes, faulty locks or draughty windows, we offer simple, cost-effective repairs that help you get more from your windows.
